Update yolink "play on speaker hub" action to allow optional values (to match YoLink API)

[mxr]

Proposed change

The SpeakerHub.playAudio accepts optional arguments for the tone, repeat, and volume parameters. But the HA service definition makes these arguments required. I've updated the service definition so that the arguments are optional.

Note that the current logic also sets repeat to 0 when it's unset by the user so I have preserved that logic.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request: Document optional arguments for yolink "play on speaker hub" service home-assistant.io#36324

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works. ← this part of the code doesn't have existing tests, and I struggled a bunch to add tests, but wasn't able to. I got stuck with trying to run this integration's async_setup in the test environment.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

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  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
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[home-assistant]

Hey there @matrixd2, mind taking a look at this pull request as it has been labeled with an integration (yolink) you are listed as a code owner for? Thanks!

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[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[mxr]

@joostlek do you mind taking another look please? Thank you!

[mxr]

Hi @joostlek checking in on if you can review this again. Thank you!